Reclusive and reportedly ailing bank heir spends most of his time at his compound in Jeddah. Saw a $1.8 billion windfall from the sale of his stake in National Commercial Bank to the Saudi government in 2002 and has devoted most of his time since then to investing in real estate. Also has (successfully) sued journalists 3 times for libel over accusations that he helped fund the Sept. 11 attacks. Reportedly recently paid an undisclosed amount to a British contractor who filed a lawsuit last year alleging Bin Mahfouz had reneged on payments owed for opulent renovations on his mansion in Mayfair, U.K..